I would question the following assumptions:
we have had to chase him around the front yard .....I have to drive him kicking and screaming to school. ...He says we are just trying to get rid of him and he hates us.... He just refuses to listen and every morning is a battle.
you don't HAVE to chase him around the yard
It's no wonder he doesn't feel listened to, he's trying to tell you he doesn't want to go, he feels abandoned (you're just trying to get rid of me) and yet HE is the one who needs help?
I hope I'm not coming off harsh, but this boy is trying to tell you he doesn't want to go.
Is there a reason? The reason he's giving you is that he's feeling abandoned. That's serious.
You do have a choice about the relationship you build. In my opinion, you're setting yourself up for a relationship without trust. Don't assume the child is damaged or defective. He's exasperated because you're not listening. People don't like to feel that they can't trust their caregivers.
Imagine if you were in his shoes. This does NOT sound like an "attached" relationship.
Who is the one "refusing to listen" when you're carrying him to the bus stop and he's kicking, screaming, punching and biting?